Results 21 to 30 of about 2,045,808 (218)
Circumstellar matter around the candidate protostar EL29 [PDF]
Symposium - International Astronomical Union, 1987 Infrared speckle interferometric observations at 3.6 μm carried out at the ESO 3.6m telescope have indicated that EL29, a deeply embedded infrared source in the Ophiuchus dark cloud (Elias 1978), appears to have a core-halo structure (Zinnecker, Chelli and Perrier 1989). A fit to the data gave angular scales of order of 0.05 arcsec for the core and 3.5
H. Zinnecker, C. Perrier, A. Chelli
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Microlensing of circumstellar envelopes: II. emission lines from radial and azimuthal flow during fold caustic crossings [PDF]
, 2003 This paper examines the line profile evolution due to bulk motion in circumstellar envelopes during microlensing fold caustic crossing events. These events have recently been shown to be a sensitive probe of stellar surface brightness profiles, thus ...
Bryce, H.M. +5 more
core +1 more source
The Astrophysical Journal Letters, 2023 We report C, N, Mg-Al, Si, and S isotope data of six 1–3 μ m-sized SiC grains of Type X from the Murchison CM2 chondrite, believed to have formed in the ejecta of core-collapse supernova (CCSN) explosions.
Peter Hoppe +3 more
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Microlensing of circumstellar envelopes III. Line profiles from stellar winds in homologous expansion [PDF]
, 2006 This paper examines line profile evolution due to the linear expansion of circumstellar material obsverved during a microlensing event. This work extends our previous papers on emission line profile evolution from radial and azimuthal flow during point ...
Bryce, H.M. +8 more
core +1 more source
MODELS OF CIRCUMSTELLAR MASERS IN BIPOLAR OUTFLOWS
Odessa Astronomical Publications, 2017 Sources of molecular maser radio emission in envelopes of late-type variable stars (red giants and supergiants) are considered. Radio and optical data on asymmetry of mass loss process in red giants are briefly reviewed.
G. M. Rudnitskij
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The Circumstellar Matter of Cygnus X-3 [PDF]
Symposium - International Astronomical Union, 1998 X-ray source in Cyg X-3 is embedded in the photo-ionized circumstellar gas. Recombination edges and emission lines were detected by ASCA observation (Kawashima, Kitamoto 1996; Liedahl, Paerels 1996). The strength of the Kα line and the recombination edge are simply determined by the atomic process.
S. Kitamoto, K. Kawashima
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SN 2020bio: A Double-peaked, H-poor Type IIb Supernova with Evidence of Circumstellar Interaction
The Astrophysical Journal, 2023 We present photometric and spectroscopic observations of SN 2020bio, a double-peaked Type IIb supernova (SN) discovered within a day of explosion, primarily obtained by Las Cumbres Observatory and Swift.
C. Pellegrino +14 more
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Star Formation and the Circumstellar Matter of Young Stellar Objects [PDF]
Symposium - International Astronomical Union, 1987 We propose that the formation of low mass stars in molecular clouds takes place in four stages. The first stage is the formation of slowly rotating cloud cores through the slow leakage of magnetic (and turbulent) support by ambipolar diffusion. These cores asymptotically approach quasistatic states resembling singular isothermal spheres, but such end ...
Frank H. Shu, Fred C. Adams
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NASA plans relevant to the study of circumstellar matter [PDF]
Symposium - International Astronomical Union, 1987 The Astrophysics program of the National Aeronautics and Space Administration of the United States emphasizes use of vehicles to obtain above-the-atmosphere observational advantages, including expanded electromagnetic frequency access, enhanced sensitivity resulting from reduced or eliminated atmospheric absorption of light and image smearing.
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Circumstellar matter as detected by IRAS - Some systematics [PDF]
Symposium - International Astronomical Union, 1987 Most of the sources noted by the Infrared Astronomical Satellite are, as expected, more or less normal cool giant stars, but a very large number of objects of earlier spectral type were also picked up. These cases must involve, in a variety of ways, circumstellar gas and dust.
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